Virtual PC

I have just installed Virtual PC on my OS X system. I hope to use
this in my initial platform testing for Revolution projects. I
think Virtual PC has been mentioned on this list.
Any warnings or advice?
If I get a new PC for development before I get a new Mac, I might
move all this to the PC.
This will be primarily for Windows testing, but I might set up a
linux. I hope to find one in the intersection of those popular,
those that work on Virtual PC and those that work with Revolution.
Suggestions?
Dar Scott